Most accurate way to find a memory leak is to install your apps one by one or delete them one by one to find the culprit. I've requested some help from the other BBOS staff members, so sit tight and hopefully we can get you a more concrete answer!

Thanks dbone. Unfortunately deleting all the apps one by one would take a while to sit and watch for memory leaks, although I could only do the ones that are detected by the "Switch Application" menu (which detects running apps) for apps that I haven't launched but run in the backround. I have a strong feeling that it is Google Maps. But it would be too much of a hassle to delete one by one and watch for leaks.

Wow that's really sad that .81 is the official OS download T-Mobile offers for the 8320. I would recommend that you upgrade your OS to a newer version. AT&T has version 4.5.0.182 that you can load on your device, provided you removed the vendor.xml file.